DEVICE HAVING MULTIPLE CHANNELS WITH CALIBRATION CIRCUIT SHARED BY MULTIPLE CHANNELS

摘要

An apparatus includes a first channel, a second channel and a calibration circuit. The first channel includes a first command control circuit. The second channel includes a second command control circuit independent of the first command control circuit. The calibration circuit is shared by the first channel and the second channel to generate a calibration code responsive to a calibration command generated responsive to a first calibration command from the first command control circuit and a second calibration command from the second command control circuit.

主权项

1. An apparatus comprising:
a first channel including a first command control circuit, a first memory cell array configured to be controlled by the first command control circuit and a first data output circuit configured to output first data from the first memory cell array with first impedance controlled responsive to a first calibration code; a second channel provided independently of the first channel, the second channel including a second command control circuit, a second memory cell array configured to be controlled by the second command control circuit and a second data output circuit configured to output second data from the second memory cell array with second impedance controlled responsive to a second calibration code; and a calibration circuit provided in common to the first channel and the second channel to provide the first calibration code responsive to a first calibration control signal from the first command control circuit and a second calibration code responsive to a second calibration control signal from the second command control circuit.